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A reversible preconcentration of gold nanoparticles (AuNPs) can be used for chemical analysis based on surface-enhanced Raman scattering in a microfluidic system. AuNPs homogeneously dispersed in solution are locally preconcentrated by charge-selective ion extraction through a pair of negatively charged polyelectrolyte plugs. This phenomenon creates dynamic hot spots among the preconcentrated AuNPs, which can also be redispersed as required.
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Kim et al. (2011) studied this question.
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